Initial Period of Stay Extension of Stay
1 to 6 months; 6 months is the maximum
Extension of Stay
Up to 6 months; maximum total amount of time permitted in B-1 status on any one trip is generally 1 year.
At the port of entry, an immigration official must authorize your admission to the United States, and, if you are eligible for admission, you may be admitted initially for the period necessary to carry out your business activities, up to a maximum period of 1 year. If you who wish to stay beyond the time indicated on the Form I-94 without departing from the United States, you must file Form I-539, Application to Extend/Change Nonimmigrant Status and submit any required supporting documents to USCIS.